Globe and carbon holder for arc lamps



July 12, 1932- H. J. BRUNK GLOBE AND CARBON HOLDER FOR ARC LAMPS Filed Jan. 16, 1930 -TN kl.. u. .n IJ |11 Il 11|. l ,\\\\\\\\\\\\"l| Patented July 12, 1932 UNITED STATES PATENT ori-ice HAROLD J. IBR'UNK, OF CHICAGO, ILLINOIS, .ASS-IGNOR TO C. IF. IPEASE COMPANY, A C`OR PORATION F DELAWARE GLOBE AND CARBON HOLDER FOR ARC LAMPS Application filed January 16,v 1930. Serial No. 421,091.

This invention relates to improvements in globe and carbon holders for arc lamps.

One Vobject of the invention is to provide a holder which will accommodate globes,

horizontal planes, or which during use may assume a non-horizontal position due to uneven expansion of the globe, the holder having a member adapted to iit closely against the base of the globe in all such positions to prevent the passage of air into the globe through the bottom thereof.

Another object of the invention is to provide a holderV which can be adjusted vertically on positioning a globe thereon, and which permits the adjustment or removal of the lower carbon for renewal or trimming without disturbing the adjustment of the holder with reference to the globe.

Another object of the invention is to pro- Y vide'a structurehaving a detachable member for supporting a carbon holder which j forms an air tight connection with the holder and associated parts, thereby preventing the passage of air upwardly through the structure into the globe.

Other objects' relate to various features` of construction and arrangement of parts,

and which will' be apparent from the consideration of the following specification and accompanying drawing, wherein Fig. 1 is a side elevation ofan arc lamp and certain' related structure embodying the present improvements.

Fig. 2 is an enlarged broken vertical sectional view taken on line 2-2 of Fig. 1 illustrating the globe and carbon holder in detail.

` In the drawing, 10 is any suitable bracket or support which may be secured to the upper structure 11 of the arc lamp whichfper Se forms no part of the present improvements. The bracket 10 at its lower end may be pro-'- vided with a threaded opening into which is.

screwed a hollow or tubular 'supporting member 12. The member 12 is threaded on its exterior preferably to permit adjustment of the support vertically with reference to themember 10. The upper end of the support 12 is preferably provided with an annular flange '13 to which afleXible diaphragm 14 is clampedY evenly during the operation of the lamp the by a ring To the outer periphery of the 17 and by screws 18; the bases of which are not disposed in true y 'lo'prevent leakage of air through the con- 55 nections between the support 12 and the seat 16, an asbestos or other washer 19 may be employed. The support 12 is provided with an innery annular rib 2O upon which `is supported a coil spring 2l which presses up` wardly against the seat member 16. As will be apparent-this construction will hold the seat firmly and closely against the base of the globe 22 and should the globe expand unseat can adjust itself due to the flexibility of the diaphragm 14 to always maintain the ydesired close contact with the base of the globe. A carbon holder 23 is provided having a socket 24 in its upper end for holding a lower carbon 25. The holder 23 preferably is arranged so that it can be compressed against the carbon as by cutting a slot 26 therein to form abifurcated structure. The slot eX- tendsdownwardly to -a point beneath a..V

tapered wall 27 of the holder as shown in Fig. 2. The tapered wall portion 27 is. arranged to contact with correspondingly tapered wall portion-28 of the detachable holder retaining member 29. Member 29 has its upper end exterorly threaded for engagement with interior threads of the support 12. The member 29 preferably has a knurled portion 30 for convenience in attaching or detachingthe same from the member 12. The

lower end of the carbon holder 23 is threaded for receiving a knurled nut 31. By turning the nut 31v the holder 23 will be drawn downwardly through the detachable member 29 whereby the coacting inclined walls -will effect a compression of the portions of the holder against the carbon 25 thereby firmly holding the same within the socket 24. It will be apparent that members 23, 29 and 31 may be assembled together with a carbon and manipulated as a unit and placed in the position shown in Fig. 2 by merely screwing the member 29 into position in thel support 12. n The threaded connection between the member 29 and the support 12 VandV between;

globe is not symmetrically located with reerence to the vertical axis of the carbons, but is a little to one side of said axis as shown by the dot and dash line, illustrating a condition that arises in practice, and after the globe Vhas been in use the bottom may assume an inclined position instead of a horizontal position as shown in the lower-part of Fig. 1.

The seal at the bottom is maintained effective under all these and other varying conditions.

It will also be seen that the lower carbon iits into a comparatively shallow recess in the upper end of the carbon holder 23, as distinguished from the earlier form in which the 'carbon extended several inches into a tubular member in which it was clamped by a set screw. Arcing oftenV developed between the set screw and the carbon, resulting in damage to the apparatus, and furthermore, in renewing the lamp la substantial length of A carbon had to be discarded. With my improved arrangement, the lower end of thev carbon isclamped for a short distance yonly by what may be termed yieldingclamping jaws'23 which, however, engage a sufliciently llarge area to insure good electrical contact even though the carbon projects only a short distance into the clamping members. With' Y this arrangement, when the carbon burns j down as far as it is practicalto use it, only a very short length needs to be discarded,

fand; thus a considerable 'economy in carbons is eli'ected.

Although I have shown and described certain features of my improvements for the purpose of illustration, I do not wish to be restricted Vspecifically thereto except as so limited by the appended claims.

y W'hat I claim is:

, l. A device of the class described comprising a supporting structure, a globe seat for Y supporting an open globe thereon, a flexible' l 'diaphragm connecting said structure to said seat and permitting the vertical and angularA adjustment of the latter with reference to the normal axis of the globe, said globe seat and' v said supporting structure having aligned" openings forming a passage communicating with the interior of said globe, and a lower,

carbon holder adapted to be inserted in said passage for closing-the same and Vfor supy jport-ing a lower carbon Within said globe.

2. A device of the class described compris-I` ing a hollow supporting member, an aper-` tureddiaphragm secured at its inner periphery to said member, an apertured globe seat for an open end globe secured to the outer periphery of said diaphragm and supported thereby above said supporting member, said diaphragm being flexible to permit of'vertical and angular adjustment of said seat with reference to the axis of a lamp supported thereby, a lower carbon holder insertable upwardly into said hollow support- `ing member for 'supporting 'a carbon within Vsaid globe, and means for adjusting said holder vertically within said support and for sealing the latter against admission of air throughjthe same. j Y

3. A device of the class described comprising a hollow-supporting member,an apertured diaphragm secured thereto at its'inner periphery, ya globe seat secured to the outer periphery of said diaphragm and supported thereby above said supporting member, and

a spring interposed between saidmember and said seat for holding said seat in contact with the base of a globe positioned thereon, said diaphragm being flexible to permit the adj ustment of said seat vertically and angularly` 'with respect tothe axis odsaid-glob'e and having air tight connections with both said 'seat and supporting member. Y

4. A device of the class described comprising atubular support, an apertured diaphrag-m ksecured at its inner periphery to said support,a globe seat positioned above said-support and secured to the outer periphery of said diaphragm, said diaphragm being flexible to permit the adjustment of said seat vertically 'and -angularly with respect to the` axis of a globe seated thereon, said diaphragm having air tight connections VvWith both said support and seat, a spring carried by said support and pressing against a lower surface of said seat to hold thesame in lirm contact with the base of said globe --but1permitting of vertical and angular adj ustment of said seat, a carbon holder insertable through said tubular support from the lower end whereby-a carbon: carried by said :holder will project into said globe, amem- -ber'detachably secured to -said support for positioning said holder thereinand a nut threadedly engagingthe lower Vend-'ot` said holder for securing the latter to said detachable member.

' v5. Adevice of the class described comprising a tubularV support, aliexibly mounted globe seat carried thereby, said seat having an opening in registration with the passage in 4said tubular support, a slotted carbon holder insertable through saidV tubularsupport from the bottom thereof for holding a Vcarbon in position within a globe on saidseat,

said holder having a 4conical exterior wall portion,a sleeve havingal conical interior wall portion andan exterior portion adapted for airtight engagement vwith said suppor t anda nut threaded to the lower end of said lOO holder for drawing said holder longitudinally Within said sleeve for effecting the coaction of said conical Wall portions to tighten said holder on a carbon Within the same, said nut contacting with said sleeve to prevent the entrance of air into said sleeve at the lower end thereof.

In testimony whereof, I have subscribed my name.

HAROLD J. BRUNK. 

